Glass Table Lamps feature some form of art-glass in their lamp bases. Glass or blown glass is used to shape beautiful designs, often with swirling colors and fluid textures. These include mercury glass, clear glass and colored glass lamps.
Since the glass is typically transparent to some degree, you'll often find that the lamp base will also light up for use as a night light. Or if not, light shining from the light bulb above will help to illuminate the lamp and make it sparkle.